Djokovic claims second World Tour Finals with thrilling win over Federer, 76 75.
You know, it started as well as Federer could hope. He was hitting awesome, got an early break, and it looked like all the good play from beating Murray would carry over to Djokovic. But, just as he's accomplished similar feats against Nadal, his opponent, this time Djokovic, clawed his way back, some based on